656213216455 has 4 divisors (see below), whose sum is σ = 787455859752. Its totient is φ = 524970573160.

The previous prime is 656213216419. The next prime is 656213216537. The reversal of 656213216455 is 554612312656.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 656213216455 - 2¹¹ = 656213214407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65621321641 + ... + 65621321650.

It is an arithmetic number, because the mean of its divisors is an integer number (196863964938).

Almost surely, 2^656213216455 is an apocalyptic number.

656213216455 is a deficient number, since it is larger than the sum of its proper divisors (131242643297).

656213216455 is a wasteful number, since it uses less digits than its factorization.

656213216455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131242643296.

The product of its digits is 1296000, while the sum is 46.

The spelling of 656213216455 in words is "six hundred fifty-six billion, two hundred thirteen million, two hundred sixteen thousand, four hundred fifty-five".